Arch brick



March 30 1926.

.C. A. SIEGEL ARCH BRICK 1921 3 Sheets-Sheet l Filed Dec. 53.

. March 30 192G. v

C. A. SIEGEL ARCH BRICK Filed Dec. 31 1921 s Sheets-Sheet 2 March30,1926.

' c. A. SIEGEL ARCH BRICK Filed Dec. 51, 1921 3 SheetS Sheet dig/ENTQRBY; I Z; i,

A TTORNEYF other sort- 'on the other brick. The convex face 25 is on aprojecting nose'portion 27 at one side of the longitudinal center' lineof the brick, while the concave face 26 is at the bottom (so to speak)of a 1'ecess -portion 28. As shown, each of the faces 25 and 26 issubstantially symmetrical in reference to the thickness of the brick,and the cen-v ters of figure of these faces substantially coincideinthe'midst of the brick -i. e., about in themiddle of its thickness. Thislatter,- feature allows the brick tobe made with a shorter and stouternose 2? and a shallower recess 28 thanif the centers of figure of thefaces 25 and 26 were a substantial distance to either side of the medianplane of the brick. The conformation and relative arrangement of thecorrelatively correspond-i ing coinplementarily curved bearing faces 25and 26 are such that in the arch unit they make multiple line or surfacecontact (as distinguished from mere single line contact), even invarious reciprocally leaning angular relations of the cooperating brickson various spans. This extended contact causes the bricks 22, 22 of anarch unit to stick together over a considerable width and area as aresult of superficial fusion in service, so that if the arch isafterward temporarily taken down for any reason, these bricks will notbreak apart. As shown in Figs. 2 and 4 to" 7, the surfaces 25 and 26 aresemicircular (or semicylindrical) and of the same curvature, andtheirdiametcr is substantially equal to the thickness of the brick atits inner end.

The upper and lower corners 31 and 32 of each concave face- 26 areappropriately bevelled, reduced, or blunted,'to minimize breakage andfusion at these exceptionally weak and exposed points. At the upper endof the convex face 25, there is a shoulder 33 by which (so to speak) itscircular contour is abridged or shortened. \Vhen the arch unit isonnormal or subnormal. (short) spans, Figs. 4 and 5, the angular relationof the bricks 22, 22 is such that the shoulders 81 and 33 do not come incontact; but when the'unit. is on a supernormal (long) span ofsufficiently great width, the shoulders 31. and engage or interlock asshown in Figs. 6 and 7, and thus prevent the unit from sagging undulyordropping between the supports 17 if the span is further increasedslightly. Under the varying angular rela tions of the bricks 22, 22corresponding'to the very considerable range of span to which the bricksare intended to adjust and ac-- commodate themselves, the strength ofthe arch is substantially uniform.

As shown in Figs. 3 to (i, the bricks 2-2 are lightened somewhat byslag-retaining pockets 3-1, 34 in their lower sides.

The arch unit constitutes what may be termed a three-hinged arch; andthe pivot- .point of the center hinge at 25, 2(5 HlOVQb,

up or down as the pivot points of the outer hinges shift inward andtogether or outward and apart, according to differences in span.

The sectional fire arch 40 illustrated in Figs. 8 and 9 differs from thearch 15 of Figs. 1 and 2 in employing brick 42 that present importantdifferences from the brick 22 and afford important advantages.

In the case of Figs. 8 to 12, the engage ment means ofone sort isdivided, and located partly on opposite sides of intermediate engagementmeans of the other sort. That is to say, in the form of brick here shownthe convex face 45 on the projecting nose portion 47 is flanked ateither side by I duplicate concave faces 46, 46, at the bottom ofduplicate recesses 48, 48. As shown, each of the concave faces 46, 46and of the-1e cesses 48, 48 has substantially half the width 0f theconvcx face 45 and the nose 4?. When, therefore, two such bricks 42, 42are assembled as an arch unit, they do not overlap completely and liedirectly opposite one'another, as in Fig. 3; on the contrary, theyoverlap but half way, so as to lie in a 'stag- --gered relation to oneanother. *dlc arch section, therefore, each of the brick '42 (exceptingonly the extreme front and In the midrear ones) is in effect paired inreciprocally leaning engagement with two mates,-with each of which itforms an arch unit,iustead of with one only, as in Figs. l7. Hence thismiddle arch section consists of a series of oppositely supported bricksmultiply (doubly)intermated in reciprocally leaning pairs. By virtue ofthis construction, all of the bricks 42 (exceptthe first pair put inplace) can be put i'n place or removed one at a time. \Vith the bricks22 of l to 7,110 such possibility exists, because each of those brickscan be mated with but one other. I

As shown in Figs. '10 to 12, each brick 42 has in its opposite edges, atthe lower side. recesses 19,.

- Vhen' the bricks 42 are assembled in an arch'seclion, these recesses49 in ad1acent.

pockets were complete in eachbrick, as in Figs. 3 to 6.

The bricks 42 of Figs. 8 to 12 presents a further advantage over thebrick 22 of Figs. 1

to 7 in that when the brick 42 is used toform a lateral half arch (Fig.8 and 9) Testing against a sidesheet 20 of the fire box it is morestable, owing to the fact that its nose portion 47 which then engagesthe side sheet is in its middle instead of to one sidethere of.- Thelike is true when the brick 421s used to form a half'arch betweentwosupterrace? ports such as the tubes 17 in Fig. 12,-so that therounded surface of the nose 47 rests on a tube 17.

In Figs. 8 to 12, various parts and features substantially likecorresponding ones in Figs. 1 to 7 have been marked with the samereference numerals as in Figs. 1 to 7, as a means of avoiding merelyrepetitive description.

If desired, half brick 52 (similar in general form to the brick 22 ofFigs. 1 to 7) may be employed to 'fill gaps that would otherwise existin the arch 45, as shown in Fig. 8.

What I claim is:

1. An arch brick having on one end convex and concave faces,eachsyminetrical as regards the thickness of the brick, for engagementwith correlatively corresponding concare and convex faces of anotherbrick in various reciprocally leaning angular relations of such brickson various spans.

2. An arch brick having on one end con-- vex and concave faces withcoincident centers of figure in the midst of the brick, so that thebrick may lean stably against another brick, in various angularrelationson different spans, by engagement of its aforesaid faces withcorrelative-1y corresponding concave and convex faces 01% such otherbrick.

8. An arch brick having on one end convex and concave faces of diameterssubstantially equal to the thickness or the brick midst thereof, forengagement with 'corre latively corresponding concave and convex facesof another brick in various orecrpro- .cally leaning angul r relations,of such bricks on various spans. Y

4. An arch brick having on one end convex and concave races, witlicenters of figure in the midst of'tliebrick, adapted to make multipleline contact, respectively,

with coincident centers of figure in the same curvature, concentric withone another and with the thickness of the brick, for

making surface contact with correlatively prising counterpart arch brickhaving at one end correlative recess and projecting nose portions, withrounded concave and convex bearing surfaces of the same curvature withtheir centers of figure in the midst of the brick.

8. An arch brick having on one end con vex and concave faces forengagement with correlatively corresponding concave and convex faces ofanother brick in various reciprocally leaning angular relations of suchbricks on various spans, and having shoulders adjacent such faces forengaging with corresponding shoulders on such other brick to preventundue sagging of the brick on long spans. 1

9. A brick for sectional fire arch construction having on one endengagement means .ofone sort flanked ateither side by engagement meansof a different sort, so that the brick/may lean stably against one ormore similar ,brick by engagement of its flank engagement means with theintermediate engagement means of such other brick or bricks, and viceversa.

10. A sectional fire arch construction comprising an arch briclf'havmgat one end an intermediate projecting nose portion with recess portionseach of substantially half its Width flanking it, said nose and recessportions being in leaning engagement, respectively, with the correlativeflank and nose portions of one or more similar brick. v i

11. An arch brick having atone end a convex faced intermediateprojecting. nose portion and concave faced recess portions flanking itat either side, for leaning engagement with the correlative flank andnose portions, respectively, of one or raoresimi, lar bricks. 1

12. An arch brick having onone end convex and concave faces, includingan intermediate face of one sort flanked, at either side. by faces ofthe other sort, so that the brick may lean stably against one or moreother such brick, in various angular relations on diiiferent spans. byengagement of its flank face or faces with the intermediate face orfaces of such other brick or bricks and engagement of its intermediateface with the flank -face or faces of such other brick or bricks.

13. A33 arch brick having on oneend a convex intermediate faceandconcisve faces flanking'its at either side, so that the brilzk maylean stably against one or more other such bricks, in various angularrelations on different spans, by engagement of its convex face with theconcave face 01' faces of such other brick, and vice versa'. I

In testimony whereof, I have hereunto signed my name.

CHESTER A. SIEGEL.

